Forces
A push or pull
Force
Kinetic energy
Surface with a lot of friction
A rough surface (carpet, sandpaper, etc.)
A group of parts that work together as a whole?
System
Why do roller coasters slow down?
The force that pulls things down and gets stronger when the object is bigger
Gravity
Potential energy
Surface with very little friction
Smooth surfaces (ice and plastic)
What comes out of a system?
Output
What needs to be at the start of a roller coaster?
A big hill
Does it take more or less force to move a large object?
More force
Where is there the most potential energy on a roller coaster?
At the top of the highest hill
Does it take more or less force to move an object over a rough surface?
More force
What goes into a system?
Input
What takes roller coaster cars around loops?
Kinetic energy
Where is there the most kinetic energy on a roller coaster?
At the bottom of the highest hill
What evidence do we have that ice has less friction than grass?
It is easier to move an object over ice than grass
What is an example of an energy system?
Why are hill an important part of a roller coaster design?
They create potential energy?
Why do objects need a force to change their movement?
Objects can only move with energy, an object without a force will just stay still
What is it called when energy moves from one object to another?
Transfer
What kind of energy leaves an object because of friction?
Heat energy